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A gallon of paint thinner to a tank of gasoline?

Hello everyone, I recently sent vehicle back to agent to rectify a leaking issue. Water pump and several clips were replaced. 2 weeks ln, I notice coolant level is dropping rapidly again and it now smells like paint thinner, there is also an oily film on the surface. What can cause sweet smelling coolant to turn into an oily liquids which smells like paint thinner? Some gasket leak? Thanks.

Hi all, I believe we have all heard that the thinner the engine oil, the easier it is to flow to various parts of the engine thereby giving better protection during start up? But, I realised that lube oil pumps are basically gear pump, they are positive displacement pumps, where capacity is directly proportional to the rotation speed. The capacity of gear pumps should not be affected by the viscosity of engine oil under our local climate, whether 0w20 or 20w50 the flow rate from a positive displacement pump should be almost the same, right? Maybe cold countries where temperature are freezing and the pour point of oil are affected, then perhaps the engine oil viscosity would affect the capacity of gear pumps. The oil if get too thick due to cold weather then the relieve valve of the pump will blow (by-pass back to suction?) due to higher pumping pressure, so discharge volume will reduce. If that is the case, then for our local environment whether using thinner or thicker oil the protection should be same at start-up? Perhaps the advantage of thinner oil is only for better fuel efficiency only? What do you think?

Help guys, I just got a 96 Civic VTI today. Problem is that there is a smell coming out from the vent if the circulation is switched to external. Smells like thinner or petrol.....What could be the fault. I will be bringing the car to my mech tomorrow just to be safe. And are there shops that sell Honda rims which ppl trade in cos I'm looking for one. Thanks.